How severe is CVE-2026-43915?

CVE-2026-43915 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-43915 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-43915?

CVE-2026-43915 affects Coturn Project Coturn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-43915?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-43915 have an EU (EUVD) identifier?

Yes. CVE-2026-43915 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37939.

When was CVE-2026-43915 published?

CVE-2026-43915 was published on 2026-06-18 and last updated on 2026-06-26.

CVE-2026-43915

CVE-2026-43915 is a medium-severity vulnerability in Coturn Project Coturn with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37939
Weakness: CWE-79
Affected product: Coturn Project Coturn
Published: 2026-06-18
Last modified: 2026-06-26

Description

Coturn is a free open source implementation of TURN and STUN Server. Versions prior to 4.11.0 contain a stored cross-site scripting (XSS) vulnerability in the web-admin HTTPS interface. An attacker who can create a TURN allocation with a crafted USERNAME value can inject HTML/JavaScript that executes when an authenticated web-admin user views the TURN session list. In configurations using anonymous TURN access (--no-auth), this may be exploitable without TURN credentials. In authenticated deployments, exploitation requires valid TURN credentials or control over a provisioned username. This issue has been fixed in version 4.11.0.

Frequently asked questions

What is CVE-2026-43915?: Coturn is a free open source implementation of TURN and STUN Server. Versions prior to 4.11.0 contain a stored cross-site scripting (XSS) vulnerability in the web-admin HTTPS interface. An attacker who can create a TURN allocation with a crafted USERNAME value can inject HTML/JavaScript that executes when an authenticated web-admin user views the TURN session list. In configurations using anonymous TURN access (--no-auth), this may be exploitable without TURN credentials. In authenticated deployments, exploitation requires valid TURN credentials or control over a provisioned username. This issue has been fixed in version 4.11.0.
How severe is CVE-2026-43915?: CVE-2026-43915 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-43915 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-43915?: CVE-2026-43915 affects Coturn Project Coturn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-43915?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-43915 have an EU (EUVD) identifier?: Yes. CVE-2026-43915 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37939.
When was CVE-2026-43915 published?: CVE-2026-43915 was published on 2026-06-18 and last updated on 2026-06-26.

References

Affected products (1)

cpe:2.3:a:coturn_project:coturn:*:*:*:*:*:*:*:*

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